/Engine/Source/Runtime/SlateCore/Public/Styling/SlateStyleRegistry.h
Populate an array of slate brushes with all of the resources used by the registered styles.
static void GetAllResources ( [TArray](API\Runtime\Core\Containers\TArray)< const [FSlateBrush](API\Runtime\SlateCore\Styling\FSlateBrush) * > & OutResources )